1-Chloro-4-(chloromethyl)benzene → [(6R,7S)-9-(4-chloro-benzyl)-6-methyl-8-oxo-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-yl]-carbamic acid tert-butyl ester

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Reaction Steps

A solution of 0.10 g (342 mmol) ((6R,7S)-6-methyl-8-oxo-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-yl)-carbamic acid tert-butyl ester in 1 ml dimethylformamide was added at 0° C. over a period of 20 minutes to a suspension of 0.015 g (342 mmol) sodiumhydride (55%) in 2 ml dimethylformamide. After 30 minutes 0.056 g (342 mmol) 4-chlorobenzylchloride was added and stirring was continued for 3 hours at 0° C. Extraction with water/ethylacetate and chromatography on silicagel with ethylacetate/heptane yielded 0.12 g (84%) [(6R,7S)-9-(4-chloro-benzyl)-6-methyl-8-oxo-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-yl]-carbamic acid tert-butyl ester as white solid, MS m/e (%): 417.2 (M+H+, 69), 361.2 (100), 317.1 (91).

Provenance & Evidence